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status-react/nix/deps/clojure/README.md
Jakub Sokołowski d1442b306a
nix: stop downloading POMs for Clojure dependencies 
Clojure dependencies require only JARs to work. Downloading POMs is both
a waste of time, space, and bandwidth. In addition POMs create edge
cases that we would have to handle, an would rather avoid.

For example, the `guice` package which shows up in the classpath
includes a JAR named `guice-4.2.2-no_aop.jar`. The issue with that is
that there is no corresponding POM in the directory:
https://repo1.maven.org/maven2/com/google/inject/guice/4.2.2/

Either we have to make a special case for such packages, or we can just
skip POMs entirely and avoid the mess.

Signed-off-by: Jakub Sokołowski <jakub@status.im>
2023-10-13 15:23:41 +02:00

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Description

This folder contains the scripts and Nix derivations necessary to generate Clojure dependencies for this project.

Usage

Running generate.sh in a shell that has available shadow-cljs and clojure should update the deps.list and deps.json files.

Details

By using the following command:

shadow-cljs classpath --force-spawn

We download the necessary JARs into ~/.m2 folder, but also get the classpath printed into standard output. We skip POM files since they are not necessary, and add edge cases we don't want to handle.

We then use the classpath in combination with contents of ~/.m2 folder to generate the following files:

  • deps.list - List of JARs relative to the ~/.m2 cache folder.
  • deps.json - Full list of JARs including their SHAs.

The deps.list file is just intermediate and for debugging purposes. The deps.json is loaded by the derivation in default.nix and used to produce a derivation that contains all the necessary dependencies:

 > grep cljfmt nix/deps/clojure/deps.list
cljfmt/cljfmt/0.6.7/cljfmt-0.6.7.jar

 > nix-build --no-out-link -A pkgs.deps.clojure
/nix/store/d7p8r9vhq6z2jmxwakxpcb262wgkc86s-status-mobile-clojure-deps

 > DEPS=$(nix-build --no-out-link -A pkgs.deps.clojure)                              

 > find $DEPS -iname 'cljfmt-0.6.7.*'
/nix/store/d7p...86s-status-mobile-clojure-deps/cljfmt/cljfmt/0.6.7/cljfmt-0.6.7.pom.sha1
/nix/store/d7p...86s-status-mobile-clojure-deps/cljfmt/cljfmt/0.6.7/cljfmt-0.6.7.pom
/nix/store/d7p...86s-status-mobile-clojure-deps/cljfmt/cljfmt/0.6.7/cljfmt-0.6.7.jar.sha1
/nix/store/d7p...86s-status-mobile-clojure-deps/cljfmt/cljfmt/0.6.7/cljfmt-0.6.7.jar